Results 61 to 70 of about 374,145 (293)

Dynamics of electron beams in the solar corona plasma with density fluctuations [PDF]

, 2001
The problem of beam propagation in a plasma with small scale and low intensity inhomogeneities is investigated. It is shown that the electron beam propagates in a plasma as a beam-plasma structure and is a source of Langmuir waves.
Benz, Benz, Cairns, Chaizy, Churaev, Coste, Cronyn, E. P. Kontar, Ginzburg, Goldman, Gopalswamy, Hishikawa, Kontar, Kontar, Kontar, Lapshin, Lin, Magelssen, Melrose, Melrose, Melrose, Muschietti, Papadopoulos, Robinson, Robinson, Robinson, Ryutov, Ryutov, Smith, Takakura, Takakura, Thejappa, Vedenov   +32 more
core   +2 more sources

Poincaré Bessel beams: structure and propagation [PDF]

Journal of Optics, 2019
Abstract Non-separable superpositions of polarization and spatial modes in Gaussian beams have shown rich patterns of spatially-variable polarization encoded in the transverse mode of the light, with the potential for many applications. In this work, we investigate encoding similar types of superpositions in Bessel beams. We find that
Brianna M Holmes, Enrique J Galvez
openaire   +2 more sources

Numerical Exploration of Thermal Shock Resistance in MgO–C Refractories

Advanced Engineering Materials, EarlyView.
A mesostructure‐resolved numerical framework is developed to evaluate the thermal shock resistance of MgO–C refractories. By modeling interface debonding under rapid temperature changes and introducing a modified thermal shock parameter that accounts for mesocracks, the study shows how graphite content and aggregate size influence thermal shock ...
Jishnu Vinayak Gopi, Stephan Roth, Christos G. Aneziris, Bjoern Kiefer   +3 more
wiley   +1 more source

Hollow vortex Gaussian beam expressed in terms of cylindrical wave

Journal of Physics Communications
The electrical field of hollow vortex Gaussian beam (HVGB) with an arbitrary combination of the beam order and topological charge is formulated by using the cylindrical wave spectrum representation (CWSR), which satisfies Maxwell’s equations rigorously ...
Shiliang Zhong, Jianxin Lin, Jianqi Shen
doaj   +1 more source

Optical Differentiation and Edge Detection Based on Birefringence of Uniaxial Crystals

Photonics
Optical differential operations can directly extract edge information from images and have significant application potential in fields such as image processing and object recognition.
Xu Chen, Ping Huang, Xuan Tang, Xunong Yi   +3 more
doaj   +1 more source

Effects of inhomogeneity on electrostatic ion cyclotron instability excited by a particle beam

AIP Advances, 2019
Electrostatic ion cyclotron (EIC) waves excited by a particle beam are studied in a magnetized inhomogeneous collisionless plasma using linear Vlasov theory.
S. M. Khorashadizadeh, M. Barati Moqadam Niyat   +1 more
doaj   +1 more source

Hydrogen‐Assisted Fracture of Iron‐Based Fe–Ni–Al Alloys

Advanced Engineering Materials, EarlyView.
Principal relations and fracture mechanisms of single‐phase and precipitate‐strengthened Fe–Ni–Al alloys subjected to prior electrochemical hydrogen charging are identified. The mechanisms of hydrogen effect on strength and microhardness are discussed, including hydrogen‐induced increase in microhardness and the role of hydrogen in fracture behavior ...
Nataliya Yadzhak, Olha Zvirko, Rostyslav Leshchak, Hryhoriy Nykyforchyn   +3 more
wiley   +1 more source

The Fresnel Approximation and Diffraction of Focused Waves

Photonics
In this paper, diffraction of scalar waves by a screen with a circular aperture is explored, considering the incidence of either a collimated beam or a focused wave, a historical review of the development of the theory is presented, and the introduction ...
Colin J. R. Sheppard
doaj   +1 more source

TINJAUAN LEBAR RETAK PADA BALOK BETON BERTULANG DENGAN VARIASI TEBAL SELIMUT BETON HORISONT [PDF]

, 2006
The collapse occurred beam begins with the onset of cracking. The emergence of such cracks are very smooth and parallel to the axial beam propagating from the bottom up and quit after the ultimate.
WIBOWO, AFEB NOFI
core  

Discrete diffraction and shape-invariant beams in optical waveguide arrays

, 2009
General properties of linear propagation of discretized light in homogeneous and curved waveguide arrays are comprehensively investigated and compared to those of paraxial diffraction in continuous media.
A. E. Siegman, F. W. J. Olver, J. M. Ziman, S. G. Krivoshlykov, Stefano Longhi   +4 more
core   +1 more source